Tube, Cat. II & III, Start Year: 01/01/1975

Used in models:4400, 3500, 3400, 535, 4410, 420, 3550, 335, 4140, 532, 515, 4500, 2600R, 5340, 3150, 531, TW20, 2100, 3600, 3100, 7600C, 8000-SERIES, 6600, TW10, 2300, 2310, TW30, 4600SU, 3000-SERIES, 3110, 4330, 6600C, 9000-SERIES, 4600O, 8600, 3055, 4200, 7000-SERIES, 2120, 3300, 4340, 9600, 3600R, 6700, 4000-SERIES, 3330, 5190, 7700, 3900, 8700, 5200, 3600N, 3190, 5000-SERIES, 2600V, 4100, 5600, 2110, 3600NO, 6600O, 3310, 9700, 233, 5700, 4190, 7200, 5100, 4600NO, 2600N, 3120, 3600V, 7100, 2000-SERIES, 2150